A 5-month-old baby developed symptoms of cough, runny nose, hoarseness, and a possible phlegm after having a cold for over 20 days. Despite various medications including roxithromycin dry suspension, ribavirin granules, and antiviral oral liquid, the condition did not improve. After a 4-day course of lincomycin sodium injection, the doctor reported improvement, but the symptoms recurred upon returning home. The baby then took amoxicillin and pediatric paracetamol chlorpheniramine granules, but there was no improvement in the condition, and the symptoms seemed to worsen. Using medication at normal doses should not affect the baby. Based on your description, the baby may have